1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-2013 */
8 /* Code for calling virus (malware) scanners. Called from acl.c. */
11 #ifdef WITH_CONTENT_SCAN
13 /* The maximum number of clamd servers that are supported in the configuration */
14 #define MAX_CLAMD_SERVERS 32
15 #define MAX_CLAMD_SERVERS_S "32"
16 /* Maximum length of the hostname that can be specified in the clamd address list */
17 #define MAX_CLAMD_ADDRESS_LENGTH 64
18 #define MAX_CLAMD_ADDRESS_LENGTH_S "64"
20 typedef struct clamd_address_container {
21 uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH];
22 unsigned int tcp_port;
23 } clamd_address_container;
25 /* declaration of private routines */
26 static int mksd_scan_packed(int sock, uschar *scan_filename);
27 static int malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking);
29 /* SHUT_WR seems to be undefined on Unixware? */
35 # define nelements(arr) (sizeof(arr) / sizeof(arr[0]))
39 #define MALWARE_TIMEOUT 120
42 #define DRWEBD_SCAN_CMD (1) /* scan file, buffer or diskfile */
43 #define DRWEBD_RETURN_VIRUSES (1<<0) /* ask daemon return to us viruses names from report */
44 #define DRWEBD_IS_MAIL (1<<19) /* say to daemon that format is "archive MAIL" */
46 #define DERR_READ_ERR (1<<0) /* read error */
47 #define DERR_NOMEMORY (1<<2) /* no memory */
48 #define DERR_TIMEOUT (1<<9) /* scan timeout has run out */
49 #define DERR_BAD_CALL (1<<15) /* wrong command */
51 /* Routine to check whether a system is big- or litte-endian.
52 Ripped from http://www.faqs.org/faqs/graphics/fileformats-faq/part4/section-7.html
53 Needed for proper kavdaemon implementation. Sigh. */
54 #define BIG_MY_ENDIAN 0
55 #define LITTLE_MY_ENDIAN 1
56 int test_byte_order(void);
60 short int word = 0x0001;
61 char *byte = (char *) &word;
62 return(byte[0] ? LITTLE_MY_ENDIAN : BIG_MY_ENDIAN);
65 BOOL malware_ok = FALSE;
67 /* Gross hacks for the -bmalware option; perhaps we should just create
68 the scan directory normally for that case, but look into rigging up the
69 needed header variables if not already set on the command-line? */
70 extern int spool_mbox_ok;
71 extern uschar spooled_message_id[17];
73 /*************************************************
74 * Scan an email for malware *
75 *************************************************/
77 /* This is the normal interface for scanning an email, which doesn't need a
78 filename; it's a wrapper around the malware_file function.
81 listptr the list of options to the "malware = ..." ACL condition
83 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
84 where true means malware was found (condition applies)
87 malware(uschar **listptr)
89 uschar * scan_filename;
92 scan_filename = string_sprintf("%s/scan/%s/%s.eml",
93 spool_directory, message_id, message_id);
94 ret = malware_internal(listptr, scan_filename, FALSE);
95 if (ret == DEFER) av_failed = TRUE;
101 /*************************************************
102 * Scan a file for malware *
103 *************************************************/
105 /* This is a test wrapper for scanning an email, which is not used in
106 normal processing. Scan any file, using the Exim scanning interface.
107 This function tampers with various global variables so is unsafe to use
108 in any other context.
111 eml_filename a file holding the message to be scanned
113 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
114 where true means malware was found (condition applies)
117 malware_in_file(uschar *eml_filename)
119 uschar *scan_options[2];
120 uschar message_id_buf[64];
123 scan_options[0] = US"*";
124 scan_options[1] = NULL;
126 /* spool_mbox() assumes various parameters exist, when creating
127 the relevant directory and the email within */
128 (void) string_format(message_id_buf, sizeof(message_id_buf),
129 "dummy-%d", vaguely_random_number(INT_MAX));
130 message_id = message_id_buf;
131 sender_address = US"malware-sender@example.net";
133 recipients_list = NULL;
134 receive_add_recipient(US"malware-victim@example.net", -1);
135 enable_dollar_recipients = TRUE;
137 ret = malware_internal(scan_options, eml_filename, TRUE);
139 Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
141 /* don't set no_mbox_unspool; at present, there's no way for it to become
142 set, but if that changes, then it should apply to these tests too */
145 /* silence static analysis tools */
153 malware_errlog(const uschar * str)
155 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
158 malware_errlog_defer(const uschar * str)
165 m_scanner_errlog_defer(const uschar * scanner, const uschar * str)
167 return malware_errlog_defer(string_sprintf("%s: %s", scanner, str));
171 fprotd_errlog_defer(const uschar * str)
173 return m_scanner_errlog_defer("f-protd", str);
176 drweb_errlog_defer(const uschar * str)
178 return m_scanner_errlog_defer("drweb", str);
181 aves_errlog_defer(const uschar * str)
183 return m_scanner_errlog_defer("aveserver", str);
186 fsec_errlog_defer(const uschar * str)
188 return m_scanner_errlog_defer("fsecure", str);
191 kavd_errlog_defer(const uschar * str)
193 return m_scanner_errlog_defer("kavdaemon", str);
196 cmdl_errlog_defer(const uschar * str)
198 return m_scanner_errlog_defer("commandline", str);
201 soph_errlog_defer(const uschar * str)
203 return m_scanner_errlog_defer("sophie", str);
206 clmd_errlog_defer(const uschar * str)
208 return m_scanner_errlog_defer("clamd", str);
211 mksd_errlog_defer(const uschar * str)
213 return m_scanner_errlog_defer("mksd", str);
216 sock_errlog_defer(const uschar * str)
218 return m_scanner_errlog_defer("sock", str);
222 clmd_errlog(const uschar * str)
224 log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: clamd: %s", str);
227 /*************************************************/
230 m_streamsocket(const uschar * hostname, struct in_addr * inp, uschar ** errstr)
235 /* Lookup the host */
236 if(!(he = gethostbyname(CS hostname))) {
237 *errstr = string_sprintf("failed to lookup host '%s'", hostname);
240 /*XXX will fail for ipv6 */
241 *inp = *(struct in_addr *) he->h_addr_list[0];
243 /* Create the TCP socket */
244 if ((sock = ip_socket(SOCK_STREAM, AF_INET)) >= 0)
247 *errstr = string_sprintf("unable to acquire socket (%s)", strerror(errno));
252 m_tcpsocket(const uschar * hostname, unsigned int port,
253 struct in_addr * inp, uschar ** errstr)
257 if ((sock = m_streamsocket(hostname, inp, errstr)) < 0)
260 if (ip_connect(sock, AF_INET, (uschar*)inet_ntoa(*inp), port, 5) >= 0)
263 *errstr = string_sprintf("connection to %s, port %u failed (%s)",
264 inet_ntoa(*inp), port, strerror(errno));
270 m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
273 uschar hostname[256];
274 unsigned int portlow, porthigh;
276 /* extract host and port part */
277 scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
280 *errstr = string_sprintf("invalid socket '%s'", hostport);
286 return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
291 m_unixsocket(const uschar * path, uschar ** errstr)
294 struct sockaddr_un server;
296 if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
297 *errstr = "can't open UNIX socket.";
301 server.sun_family = AF_UNIX;
302 Ustrcpy(server.sun_path, path);
303 if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
306 *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
307 path, strerror(err));
314 m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
316 if (send(sock, buf, cnt, 0) < 0) {
319 *errstr = string_sprintf("unable to send to socket (%s): %s",
327 m_pcre_compile(const uschar * re, uschar ** errstr)
329 const uschar * rerror;
333 cre = pcre_compile(re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
335 *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
336 re, rerror, roffset);
341 m_pcre_exec(const pcre * cre, uschar * text)
344 int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
345 ovector, nelements(ovector));
346 uschar * substr = NULL;
347 if (i >= 2) /* Got it */
348 pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
353 m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
355 const uschar * list_ele;
356 const pcre * cre = NULL;
358 if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
359 *errstr = US listerr;
361 cre = m_pcre_compile(CS list_ele, errstr);
365 /*************************************************
366 * Scan content for malware *
367 *************************************************/
369 typedef enum {M_FPROTD, M_DRWEB, M_AVES, M_FSEC, M_KAVD, M_CMDL,
370 M_SOPHIE, M_CLAMD, M_SOCK, M_MKSD} scanner_t;
375 const char * options_default;
378 { M_FPROTD, "f-protd", "localhost 10200-10204" },
379 { M_DRWEB, "drweb", "/usr/local/drweb/run/drwebd.sock" },
380 { M_AVES, "aveserver", "/var/run/aveserver" },
381 { M_FSEC, "fsecure", "/var/run/.fsav" },
382 { M_KAVD, "kavdaemon", "/var/run/AvpCtl" },
383 { M_CMDL, "cmdline", NULL },
384 { M_SOPHIE, "sophie", "/var/run/sophie" },
385 { M_CLAMD, "clamd", "/tmp/clamd" },
386 { M_SOCK, "sock", "/tmp/malware.sock" },
387 { M_MKSD, "mksd", NULL },
388 { -1, NULL, NULL } /* end-marker */
391 /* This is an internal interface for scanning an email; the normal interface
392 is via malware(), or there's malware_in_file() used for testing/debugging.
395 listptr the list of options to the "malware = ..." ACL condition
396 eml_filename the file holding the email to be scanned
397 faking whether or not we're faking this up for the -bmalware test
399 Returns: Exim message processing code (OK, FAIL, DEFER, ...)
400 where true means malware was found (condition applies)
403 malware_internal(uschar **listptr, uschar *eml_filename, BOOL faking)
406 uschar *list = *listptr;
407 uschar *av_scanner_work = av_scanner;
408 uschar *scanner_name;
409 uschar *malware_regex;
410 uschar malware_regex_default[] = ".+";
411 unsigned long mbox_size;
415 struct scan * scanent;
416 const uschar * scanner_options;
418 /* make sure the eml mbox file is spooled up */
419 if (!(mbox_file = spool_mbox(&mbox_size, faking ? eml_filename : NULL)))
420 return malware_errlog_defer("error while creating mbox spool file");
422 /* none of our current scanners need the mbox
423 file as a stream, so we can close it right away */
424 /*XXX drweb and clamd do!! */
425 (void)fclose(mbox_file);
427 /* extract the malware regex to match against from the option list */
428 if (!(malware_regex = string_nextinlist(&list, &sep, NULL, 0))) {
430 /* parse 1st option */
431 if ( (strcmpic(malware_regex,US"false") == 0) ||
432 (Ustrcmp(malware_regex,"0") == 0) )
433 return FAIL; /* explicitly no matching */
435 /* special cases (match anything except empty) */
436 if ( (strcmpic(malware_regex,US"true") == 0) ||
437 (Ustrcmp(malware_regex,"*") == 0) ||
438 (Ustrcmp(malware_regex,"1") == 0) )
439 malware_regex = malware_regex_default;
441 else /* empty means "don't match anything" */
444 /* Reset sep that is set by previous string_nextinlist() call */
447 /* compile the regex, see if it works */
448 if (!(re = m_pcre_compile(CS malware_regex, &errstr)))
449 return malware_errlog_defer(errstr);
451 /* if av_scanner starts with a dollar, expand it first */
452 if (*av_scanner == '$') {
453 if (!(av_scanner_work = expand_string(av_scanner)))
454 return malware_errlog_defer(
455 string_sprintf("av_scanner starts with $, but expansion failed: %s",
456 expand_string_message));
458 debug_printf("Expanded av_scanner global: %s\n", av_scanner_work);
459 /* disable result caching in this case */
464 /* Do not scan twice. */
467 /* find the scanner type from the av_scanner option */
468 if (!(scanner_name = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
469 return malware_errlog_defer("av_scanner configuration variable is empty");
471 for (scanent = m_scans; ; scanent++) {
473 return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
475 if (strcmpic(scanner_name, US scanent->name) == 0)
478 if (!(scanner_options = string_nextinlist(&av_scanner_work, &sep, NULL, 0)))
479 scanner_options = scanent->options_default;
481 switch (scanent->scancode) {
482 case M_FPROTD: /* "f-protd" scanner type -------------------------------- */
484 uschar *fp_scan_option;
485 unsigned int detected=0, par_count=0;
487 uschar * scanrequest;
488 uschar buf[32768], *strhelper, *strhelper2;
489 uschar * malware_name_internal = NULL;
491 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
492 return fprotd_errlog_defer(errstr);
494 DEBUG(D_acl) debug_printf("Malware scan: issuing %s GET\n", scanner_name);
495 scanrequest = string_sprintf("GET %s", eml_filename);
497 while ((fp_scan_option = string_nextinlist(&av_scanner_work, &sep,
499 scanrequest = string_sprintf("%s%s%s", scanrequest,
500 par_count ? "%20" : "?", fp_scan_option);
503 scanrequest = string_sprintf("%s HTTP/1.0\r\n\r\n", scanrequest);
505 /* send scan request */
506 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
507 return fprotd_errlog_defer(errstr);
509 /* We get a lot of empty lines, so we need this hack to check for any data at all */
510 while( recv(sock, buf, 1, MSG_PEEK) > 0 ) {
511 if ( recv_line(sock, buf, sizeof(buf)) > 0) {
512 if ( Ustrstr(buf, US"<detected type=\"") != NULL )
514 else if ( detected && (strhelper = Ustrstr(buf, US"<name>")) ) {
515 if ((strhelper2 = Ustrstr(buf, US"</name>")) != NULL) {
517 malware_name_internal = string_copy(strhelper+6);
519 } else if ( Ustrstr(buf, US"<summary code=\"") )
520 malware_name = Ustrstr(buf, US"<summary code=\"11\">")
521 ? malware_name_internal : NULL;
528 case M_DRWEB: /* "drweb" scanner type ----------------------------------- */
529 /* v0.1 - added support for tcp sockets */
530 /* v0.0 - initial release -- support for unix sockets */
532 struct sockaddr_un server;
535 uschar * tmpbuf, *drweb_fbuf;
536 int drweb_rc, drweb_cmd, drweb_flags = 0x0000, drweb_fd,
537 drweb_vnum, drweb_slen, drweb_fin = 0x0000;
539 const pcre *drweb_re;
541 if (*scanner_options != '/') {
542 if ((sock = m_tcpsocket_fromdef(scanner_options, &errstr)) < 0)
543 return drweb_errlog_defer(errstr);
545 /* prepare variables */
546 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
547 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
550 drweb_fd = open(CS eml_filename, O_RDONLY);
551 if (drweb_fd == -1) {
554 return drweb_errlog_defer(
555 string_sprintf("can't open spool file %s: %s",
556 eml_filename, strerror(err)));
558 fsize = lseek(drweb_fd, 0, SEEK_END);
562 (void)close(drweb_fd);
563 return drweb_errlog_defer(
564 string_sprintf("can't seek spool file %s: %s",
565 eml_filename, strerror(err)));
567 drweb_slen = htonl(fsize);
568 lseek(drweb_fd, 0, SEEK_SET);
570 DEBUG(D_acl) debug_printf("Malware scan: issuing %s remote scan [%s]\n",
571 scanner_name, scanner_options);
573 /* send scan request */
574 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
575 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
576 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0) ||
577 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0)) {
579 (void)close(drweb_fd);
580 return drweb_errlog_defer(
581 string_sprintf("unable to send commands to socket (%s)", scanner_options));
584 drweb_fbuf = (uschar *) malloc (fsize);
587 (void)close(drweb_fd);
588 return drweb_errlog_defer(
589 string_sprintf("unable to allocate memory %u for file (%s)",
590 fsize, eml_filename));
593 result = read (drweb_fd, drweb_fbuf, fsize);
597 (void)close(drweb_fd);
599 return drweb_errlog_defer(
600 string_sprintf("can't read spool file %s: %s",
601 eml_filename, strerror(err)));
603 (void)close(drweb_fd);
605 /* send file body to socket */
606 if (send(sock, drweb_fbuf, fsize, 0) < 0) {
609 return drweb_errlog_defer(
610 string_sprintf("unable to send file body to socket (%s)", scanner_options));
612 (void)close(drweb_fd);
616 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
617 return drweb_errlog_defer(errstr);
619 /* prepare variables */
620 drweb_cmd = htonl(DRWEBD_SCAN_CMD);
621 drweb_flags = htonl(DRWEBD_RETURN_VIRUSES | DRWEBD_IS_MAIL);
622 drweb_slen = htonl(Ustrlen(eml_filename));
624 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local scan [%s]\n",
625 scanner_name, scanner_options);
627 /* send scan request */
628 if ((send(sock, &drweb_cmd, sizeof(drweb_cmd), 0) < 0) ||
629 (send(sock, &drweb_flags, sizeof(drweb_flags), 0) < 0) ||
630 (send(sock, &drweb_slen, sizeof(drweb_slen), 0) < 0) ||
631 (send(sock, eml_filename, Ustrlen(eml_filename), 0) < 0) ||
632 (send(sock, &drweb_fin, sizeof(drweb_fin), 0) < 0)) {
634 return drweb_errlog_defer(
635 string_sprintf("unable to send commands to socket (%s)", scanner_options));
639 /* wait for result */
640 if ((bread = recv(sock, &drweb_rc, sizeof(drweb_rc), 0) != sizeof(drweb_rc))) {
642 return drweb_errlog_defer("unable to read return code");
644 drweb_rc = ntohl(drweb_rc);
646 if ((bread = recv(sock, &drweb_vnum, sizeof(drweb_vnum), 0) != sizeof(drweb_vnum))) {
648 return drweb_errlog_defer("unable to read the number of viruses");
650 drweb_vnum = ntohl(drweb_vnum);
652 /* "virus(es) found" if virus number is > 0 */
656 /* setup default virus name */
657 malware_name = "unknown";
659 /* set up match regex */
660 drweb_re = m_pcre_compile( "infected\\swith\\s*(.+?)$", &errstr);
662 /* read and concatenate virus names into one string */
663 for (i=0;i<drweb_vnum;i++)
665 int size = 0, off = 0, ovector[10*3];
666 /* read the size of report */
667 if ((bread = recv(sock, &drweb_slen, sizeof(drweb_slen), 0) != sizeof(drweb_slen))) {
669 return drweb_errlog_defer("cannot read report size");
671 drweb_slen = ntohl(drweb_slen);
672 tmpbuf = store_get(drweb_slen);
674 /* read report body */
675 if ((bread = recv(sock, tmpbuf, drweb_slen, 0)) != drweb_slen) {
677 return drweb_errlog_defer("cannot read report string");
679 tmpbuf[drweb_slen] = '\0';
681 /* try matcher on the line, grab substring */
682 result = pcre_exec(drweb_re, NULL, CS tmpbuf, Ustrlen(tmpbuf), 0, 0,
683 ovector, nelements(ovector));
685 const char * pre_malware_nb;
687 pcre_get_substring(CS tmpbuf, ovector, result, 1, &pre_malware_nb);
689 if (i==0) /* the first name we just copy to malware_name */
690 malware_name = string_append(NULL, &size, &off,
693 else /* concatenate each new virus name to previous */
694 malware_name = string_append(malware_name, &size, &off,
695 2, "/", pre_malware_nb);
697 pcre_free_substring(pre_malware_nb);
702 const char *drweb_s = NULL;
704 if (drweb_rc & DERR_READ_ERR) drweb_s = "read error";
705 if (drweb_rc & DERR_NOMEMORY) drweb_s = "no memory";
706 if (drweb_rc & DERR_TIMEOUT) drweb_s = "timeout";
707 if (drweb_rc & DERR_BAD_CALL) drweb_s = "wrong command";
708 /* retcodes DERR_SYMLINK, DERR_NO_REGFILE, DERR_SKIPPED.
709 * DERR_TOO_BIG, DERR_TOO_COMPRESSED, DERR_SPAM,
710 * DERR_CRC_ERROR, DERR_READSOCKET, DERR_WRITE_ERR
711 * and others are ignored */
714 return drweb_errlog_defer(
715 string_sprintf("drweb daemon retcode 0x%x (%s)", drweb_rc, drweb_s));
724 case M_AVES: /* "aveserver" scanner type -------------------------------- */
727 struct sockaddr_un server;
731 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
732 return aves_errlog_defer(errstr);
734 /* read aveserver's greeting and see if it is ready (2xx greeting) */
735 recv_line(sock, buf, sizeof(buf));
738 /* aveserver is having problems */
740 return aves_errlog_defer(
741 string_sprintf("unavailable (Responded: %s).", ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
744 /* prepare our command */
745 (void)string_format(buf, sizeof(buf), "SCAN bPQRSTUW %s\r\n",
748 DEBUG(D_acl) debug_printf("Malware scan: issuing %s SCAN\n", scanner_name);
751 if (m_sock_send(sock, buf, Ustrlen(buf), &errstr) < 0)
752 return aves_errlog_defer(errstr);
756 /* read response lines, find malware name and final response */
757 while (recv_line(sock, buf, sizeof(buf)) > 0) {
758 debug_printf("aveserver: %s\n", buf);
761 if (buf[0] == '5') { /* aveserver is having problems */
762 result = aves_errlog_defer(
763 string_sprintf("unable to scan file %s (Responded: %s).",
766 } else if (Ustrncmp(buf,"322",3) == 0) {
767 uschar *p = Ustrchr(&buf[4],' ');
769 malware_name = string_copy(&buf[4]);
774 if (m_sock_send(sock, "quit\r\n", 6, &errstr) < 0)
775 return aves_errlog_defer(errstr);
777 /* read aveserver's greeting and see if it is ready (2xx greeting) */
778 recv_line(sock, buf, sizeof(buf));
781 /* aveserver is having problems */
783 return aves_errlog_defer(
784 string_sprintf("unable to quit dialogue (Responded: %s).",
785 ((buf[0] != 0) ? buf : (uschar *)"nothing") ));
790 if (result == DEFER) return DEFER;
794 case M_FSEC: /* "fsecure" scanner type ---------------------------------- */
796 struct sockaddr_un server;
797 int sock, i, j, bread = 0;
799 uschar av_buffer[1024];
801 static uschar *cmdopt[] = { US"CONFIGURE\tARCHIVE\t1\n",
802 US"CONFIGURE\tTIMEOUT\t0\n",
803 US"CONFIGURE\tMAXARCH\t5\n",
804 US"CONFIGURE\tMIME\t1\n" };
808 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
809 return fsec_errlog_defer(errstr);
811 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
812 scanner_name, scanner_options);
815 memset(av_buffer, 0, sizeof(av_buffer));
816 for (i=0; i != nelements(cmdopt); i++) {
817 /* debug_printf("send option \"%s\"",cmdopt[i]); */
819 if (m_sock_send(sock, cmdopt[i], Ustrlen(cmdopt[i]), &errstr) < 0)
820 return fsec_errlog_defer(errstr);
822 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
823 if (bread >0) av_buffer[bread]='\0';
827 return fsec_errlog_defer(
828 string_sprintf("unable to read answer %d (%s)", i, strerror(errno)));
830 for (j=0;j<bread;j++)
831 if((av_buffer[j]=='\r')||(av_buffer[j]=='\n'))
833 /* debug_printf("read answer %d read=%d \"%s\"\n", i, bread, av_buffer ); */
834 /* while (Ustrstr(av_buffer, "OK\tServer configured.@") == NULL); */
837 /* pass the mailfile to fsecure */
838 file_name = string_sprintf("SCAN\t%s\n", eml_filename);
840 /* debug_printf("send scan %s", file_name); */
841 if (m_sock_send(sock, file_name, Ustrlen(file_name), &errstr) < 0)
842 return fsec_errlog_defer(errstr);
845 /* todo also SUSPICION\t */
846 fs_inf = m_pcre_compile("\\S{0,5}INFECTED\\t[^\\t]*\\t([^\\t]+)\\t\\S*$", &errstr);
848 /* read report, linewise */
851 memset(av_buffer, 0, sizeof(av_buffer));
853 bread=ip_recv(sock, &av_buffer[i], 1, MALWARE_TIMEOUT);
857 return fsec_errlog_defer(
858 string_sprintf("unable to read result (%s)", strerror(err)));
862 while ((i < sizeof(av_buffer)-1 ) && (av_buffer[i-1] != '\n'));
863 av_buffer[i-1] = '\0';
864 /* debug_printf("got line \"%s\"\n",av_buffer); */
866 /* Really search for virus again? */
867 if (malware_name == NULL)
868 /* try matcher on the line, grab substring */
869 malware_name = m_pcre_exec(fs_inf, av_buffer);
871 while (Ustrstr(av_buffer, "OK\tScan ok.") == NULL);
876 case M_KAVD: /* "kavdaemon" scanner type -------------------------------- */
878 struct sockaddr_un server;
882 uschar * scanrequest;
884 unsigned long kav_reportlen, bread;
888 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
889 return kavd_errlog_defer(errstr);
891 /* get current date and time, build scan request */
893 /* pdp note: before the eml_filename parameter, this scanned the
894 directory; not finding documentation, so we'll strip off the directory.
895 The side-effect is that the test framework scanning may end up in
896 scanning more than was requested, but for the normal interface, this is
898 strftime(CS tmpbuf, sizeof(tmpbuf), "%d %b %H:%M:%S", localtime(&t));
899 scanrequest = string_sprintf("<0>%s:%s", CS tmpbuf, eml_filename);
900 p = Ustrrchr(scanrequest, '/');
904 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
905 scanner_name, scanner_options);
907 /* send scan request */
908 if (m_sock_send(sock, scanrequest, Ustrlen(scanrequest)+1, &errstr) < 0)
909 return kavd_errlog_defer(errstr);
911 /* wait for result */
912 if ((bread = recv(sock, tmpbuf, 2, 0) != 2)) {
914 return kavd_errlog_defer("unable to read 2 bytes from socket.");
917 /* get errorcode from one nibble */
918 kav_rc = tmpbuf[ test_byte_order()==LITTLE_MY_ENDIAN ? 0 : 1 ] & 0x0F;
920 /* improper kavdaemon configuration */
921 if ( (kav_rc == 5) || (kav_rc == 6) ) {
923 return kavd_errlog_defer("please reconfigure kavdaemon to NOT disinfect or remove infected files.");
928 return kavd_errlog_defer("reported 'scanning not completed' (code 1).");
933 return kavd_errlog_defer("reported 'kavdaemon damaged' (code 7).");
936 /* code 8 is not handled, since it is ambigous. It appears mostly on
937 bounces where part of a file has been cut off */
939 /* "virus found" return codes (2-4) */
940 if ((kav_rc > 1) && (kav_rc < 5)) {
943 /* setup default virus name */
944 malware_name = "unknown";
946 report_flag = tmpbuf[ test_byte_order() == LITTLE_MY_ENDIAN ? 1 : 0 ];
948 /* read the report, if available */
949 if( report_flag == 1 ) {
950 /* read report size */
951 if ((bread = recv(sock, &kav_reportlen, 4, 0)) != 4) {
953 return kavd_errlog_defer("cannot read report size");
956 /* it's possible that avp returns av_buffer[1] == 1 but the
957 reportsize is 0 (!?) */
958 if (kav_reportlen > 0) {
959 /* set up match regex, depends on retcode */
960 kav_re = m_pcre_compile( kav_rc == 3
961 ? "suspicion:\\s*(.+?)\\s*$"
962 : "infected:\\s*(.+?)\\s*$",
965 /* read report, linewise */
966 while (kav_reportlen > 0) {
968 while ( recv(sock, &tmpbuf[bread], 1, 0) == 1 ) {
970 if ( (tmpbuf[bread] == '\n') || (bread > 1021) ) break;
974 tmpbuf[bread] = '\0';
976 /* try matcher on the line, grab substring */
977 if ((malware_name = m_pcre_exec(kav_re, tmpbuf)))
983 else /* no virus found */
990 case M_CMDL: /* "cmdline" scanner type ---------------------------------- */
992 const uschar *cmdline_scanner = scanner_options;
993 const pcre *cmdline_trigger_re;
994 const pcre *cmdline_regex_re;
996 uschar * commandline;
997 void (*eximsigchld)(int);
998 void (*eximsigpipe)(int);
999 FILE *scanner_out = NULL;
1000 FILE *scanner_record = NULL;
1001 uschar linebuffer[32767];
1006 if (!cmdline_scanner)
1007 return cmdl_errlog_defer("missing commandline specification");
1009 /* find scanner output trigger */
1010 cmdline_trigger_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1011 "missing trigger specification", &errstr);
1012 if (!cmdline_trigger_re)
1013 return cmdl_errlog_defer(errstr);
1015 /* find scanner name regex */
1016 cmdline_regex_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1017 "missing virus name regex specification", &errstr);
1018 if (!cmdline_regex_re)
1019 return cmdl_errlog_defer(errstr);
1021 /* prepare scanner call; despite the naming, file_name holds a directory
1022 name which is documented as the value given to %s. */
1024 file_name = string_copy(eml_filename);
1025 p = Ustrrchr(file_name, '/');
1028 commandline = string_sprintf(CS cmdline_scanner, file_name);
1030 /* redirect STDERR too */
1031 commandline = string_sprintf("%s 2>&1", commandline);
1033 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n", scanner_name, commandline);
1035 /* store exims signal handlers */
1036 eximsigchld = signal(SIGCHLD,SIG_DFL);
1037 eximsigpipe = signal(SIGPIPE,SIG_DFL);
1039 scanner_out = popen(CS commandline,"r");
1040 if (scanner_out == NULL) {
1042 signal(SIGCHLD,eximsigchld);
1043 signal(SIGPIPE,eximsigpipe);
1044 return cmdl_errlog_defer(
1045 string_sprintf("call (%s) failed: %s.", commandline, strerror(err)));
1048 file_name = string_sprintf("%s/scan/%s/%s_scanner_output",
1049 spool_directory, message_id, message_id);
1050 scanner_record = modefopen(file_name, "wb", SPOOL_MODE);
1052 if (scanner_record == NULL) {
1054 pclose(scanner_out);
1055 signal(SIGCHLD,eximsigchld);
1056 signal(SIGPIPE,eximsigpipe);
1057 return cmdl_errlog_defer(
1058 string_sprintf("opening scanner output file (%s) failed: %s.",
1059 file_name, strerror(err)));
1062 /* look for trigger while recording output */
1063 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_out)) {
1064 if ( Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record) ) {
1066 pclose(scanner_out);
1067 signal(SIGCHLD,eximsigchld);
1068 signal(SIGPIPE,eximsigpipe);
1069 return cmdl_errlog_defer(
1070 string_sprintf("short write on scanner output file (%s).", file_name));
1072 /* try trigger match */
1073 if (!trigger && regex_match_and_setup(cmdline_trigger_re, linebuffer, 0, -1))
1077 (void)fclose(scanner_record);
1078 pclose(scanner_out);
1079 signal(SIGCHLD,eximsigchld);
1080 signal(SIGPIPE,eximsigpipe);
1084 /* setup default virus name */
1085 malware_name = US"unknown";
1087 /* re-open the scanner output file, look for name match */
1088 scanner_record = fopen(CS file_name, "rb");
1089 while(fgets(CS linebuffer, sizeof(linebuffer), scanner_record)) {
1091 if ((s = m_pcre_exec(cmdline_regex_re, linebuffer)))
1094 (void)fclose(scanner_record);
1096 else /* no virus found */
1097 malware_name = NULL;
1101 case M_SOPHIE: /* "sophie" scanner type --------------------------------- */
1104 struct sockaddr_un server;
1108 uschar av_buffer[1024];
1110 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1111 return soph_errlog_defer(errstr);
1113 /* pass the scan directory to sophie */
1114 file_name = string_copy(eml_filename);
1115 if ((p = Ustrrchr(file_name, '/')))
1118 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan [%s]\n",
1119 scanner_name, scanner_options);
1121 if ( write(sock, file_name, Ustrlen(file_name)) < 0
1122 || write(sock, "\n", 1) != 1
1125 return soph_errlog_defer(
1126 string_sprintf("unable to write to UNIX socket (%s)", scanner_options));
1129 /* wait for result */
1130 memset(av_buffer, 0, sizeof(av_buffer));
1131 if ((!(bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT)) > 0)) {
1133 return soph_errlog_defer(
1134 string_sprintf("unable to read from UNIX socket (%s)", scanner_options));
1140 if (av_buffer[0] == '1') {
1141 uschar * s = Ustrchr(av_buffer, '\n');
1144 malware_name = string_copy(&av_buffer[2]);
1146 else if (!strncmp(CS av_buffer, "-1", 2))
1147 return soph_errlog_defer("scanner reported error");
1148 else /* all ok, no virus */
1149 malware_name = NULL;
1153 case M_CLAMD: /* "clamd" scanner type ----------------------------------- */
1155 /* This code was originally contributed by David Saez */
1156 /* There are three scanning methods available to us:
1157 * (1) Use the SCAN command, pointing to a file in the filesystem
1158 * (2) Use the STREAM command, send the data on a separate port
1159 * (3) Use the zINSTREAM command, send the data inline
1160 * The zINSTREAM command was introduced with ClamAV 0.95, which marked
1161 * STREAM deprecated; see: http://wiki.clamav.net/bin/view/Main/UpgradeNotes095
1162 * In Exim, we use SCAN if using a Unix-domain socket or explicitly told that
1163 * the TCP-connected daemon is actually local; otherwise we use zINSTREAM unless
1164 * WITH_OLD_CLAMAV_STREAM is defined.
1165 * See Exim bug 926 for details. */
1167 uschar *p, *vname, *result_tag, *response_end;
1168 struct sockaddr_un server;
1172 uschar av_buffer[1024];
1173 uschar *hostname = "";
1175 uschar *clamav_fbuf;
1176 int clam_fd, result;
1178 BOOL use_scan_command = FALSE;
1179 clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
1181 int num_servers = 0;
1182 #ifdef WITH_OLD_CLAMAV_STREAM
1183 uschar av_buffer2[1024];
1186 uint32_t send_size, send_final_zeroblock;
1189 if (*scanner_options == '/')
1190 /* Local file; so we def want to use_scan_command and don't want to try
1191 * passing IP/port combinations */
1192 use_scan_command = TRUE;
1194 const uschar *address = scanner_options;
1195 uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
1197 /* Go through the rest of the list of host/port and construct an array
1198 * of servers to try. The first one is the bit we just passed from
1199 * scanner_options so process that first and then scan the remainder of
1200 * the address buffer */
1202 clamd_address_container *this_clamd;
1204 /* The 'local' option means use the SCAN command over the network
1205 * socket (ie common file storage in use) */
1206 if (strcmpic(address,US"local") == 0) {
1207 use_scan_command = TRUE;
1211 /* XXX: If unsuccessful we should free this memory */
1213 (clamd_address_container *)store_get(sizeof(clamd_address_container));
1215 /* extract host and port part */
1216 if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
1217 this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 ) {
1218 clmd_errlog(string_sprintf("invalid address '%s'", address));
1222 clamd_address_vector[num_servers] = this_clamd;
1224 if (num_servers >= MAX_CLAMD_SERVERS) {
1225 clmd_errlog("More than " MAX_CLAMD_SERVERS_S " clamd servers "
1226 "specified; only using the first " MAX_CLAMD_SERVERS_S );
1229 } while ((address = string_nextinlist(&av_scanner_work, &sep,
1231 sizeof(address_buffer))) != NULL);
1233 /* check if we have at least one server */
1235 return clmd_errlog_defer("no useable server addresses in malware configuration option.");
1238 /* See the discussion of response formats below to see why we really don't
1239 like colons in filenames when passing filenames to ClamAV. */
1240 if (use_scan_command && Ustrchr(eml_filename, ':'))
1241 return clmd_errlog_defer(
1242 string_sprintf("local/SCAN mode incompatible with" \
1243 " : in path to email filename [%s]", eml_filename));
1245 /* We have some network servers specified */
1248 /* Confirmed in ClamAV source (0.95.3) that the TCPAddr option of clamd
1249 * only supports AF_INET, but we should probably be looking to the
1250 * future and rewriting this to be protocol-independent anyway. */
1252 while ( num_servers > 0 ) {
1253 /* Randomly pick a server to start with */
1254 current_server = random_number( num_servers );
1256 debug_printf("trying server name %s, port %u\n",
1257 clamd_address_vector[current_server]->tcp_addr,
1258 clamd_address_vector[current_server]->tcp_port);
1260 /* Lookup the host. This is to ensure that we connect to the same IP
1261 * on both connections (as one host could resolve to multiple ips) */
1262 sock= m_tcpsocket(CS clamd_address_vector[current_server]->tcp_addr,
1263 clamd_address_vector[current_server]->tcp_port,
1266 /* Connection successfully established with a server */
1267 hostname = clamd_address_vector[current_server]->tcp_addr;
1271 clmd_errlog(errstr);
1273 /* Remove the server from the list. XXX We should free the memory */
1276 for( i = current_server; i < num_servers; i++ )
1277 clamd_address_vector[i] = clamd_address_vector[i+1];
1280 if ( num_servers == 0 )
1281 return clmd_errlog_defer("all servers failed");
1284 if((sock = m_unixsocket(scanner_options, &errstr)) < 0)
1285 return clmd_errlog_defer(errstr);
1288 /* have socket in variable "sock"; command to use is semi-independent of
1289 * the socket protocol. We use SCAN if is local (either Unix/local
1290 * domain socket, or explicitly told local) else we stream the data.
1291 * How we stream the data depends upon how we were built. */
1293 if (!use_scan_command) {
1295 #ifdef WITH_OLD_CLAMAV_STREAM
1296 /* "STREAM\n" command, get back a "PORT <N>\n" response, send data to
1297 * that port on a second connection; then in the scan-method-neutral
1298 * part, read the response back on the original connection. */
1300 DEBUG(D_acl) debug_printf("Malware scan: issuing %s old-style remote scan (PORT)\n",
1303 /* Pass the string to ClamAV (7 = "STREAM\n") */
1304 if (m_sock_send(sock, US"STREAM\n", 7, &errstr) < 0)
1305 return clmd_errlog_defer(errstr);
1307 memset(av_buffer2, 0, sizeof(av_buffer2));
1308 bread = ip_recv(sock, av_buffer2, sizeof(av_buffer2), MALWARE_TIMEOUT);
1313 return clmd_errlog_defer(
1314 string_sprintf("unable to read PORT from socket (%s)",
1318 if (bread == sizeof(av_buffer2)) {
1320 return clmd_errlog_defer("buffer too small");
1323 if (!(*av_buffer2)) {
1325 return clmd_errlog_defer("ClamAV returned null");
1328 av_buffer2[bread] = '\0';
1329 if( sscanf(CS av_buffer2, "PORT %u\n", &port) != 1 ) {
1331 return clmd_errlog_defer(
1332 string_sprintf("Expected port information from clamd, got '%s'",
1336 if ( (sockData = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
1339 return clmd_errlog_defer(
1340 string_sprintf("unable to acquire socket (%s)", strerror(err)));
1343 if (ip_connect(sockData, AF_INET, (uschar*)inet_ntoa(in), port, 5) < 0) {
1345 (void)close(sockData); (void)close(sock);
1346 return clmd_errlog_defer(
1347 string_sprintf("connection to %s, port %u failed (%s)",
1348 inet_ntoa(in), port, strerror(err)));
1351 #define CLOSE_SOCKDATA (void)close(sockData)
1352 #else /* WITH_OLD_CLAMAV_STREAM not defined */
1353 /* New protocol: "zINSTREAM\n" followed by a sequence of <length><data>
1354 chunks, <n> a 4-byte number (network order), terminated by a zero-length
1357 DEBUG(D_acl) debug_printf("Malware scan: issuing %s new-style remote scan (zINSTREAM)\n",
1360 /* Pass the string to ClamAV (10 = "zINSTREAM\0") */
1361 if (send(sock, "zINSTREAM", 10, 0) < 0) {
1364 return clmd_errlog_defer(
1365 string_sprintf("unable to send zINSTREAM to socket (%s)",
1369 #define CLOSE_SOCKDATA /**/
1372 /* calc file size */
1373 clam_fd = open(CS eml_filename, O_RDONLY);
1374 if (clam_fd == -1) {
1376 CLOSE_SOCKDATA; (void)close(sock);
1377 return clmd_errlog_defer(
1378 string_sprintf("can't open spool file %s: %s",
1379 eml_filename, strerror(err)));
1381 fsize = lseek(clam_fd, 0, SEEK_END);
1384 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1385 return clmd_errlog_defer(
1386 string_sprintf("can't seek spool file %s: %s",
1387 eml_filename, strerror(errno)));
1389 lseek(clam_fd, 0, SEEK_SET);
1391 clamav_fbuf = (uschar *) malloc (fsize);
1393 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1394 return clmd_errlog_defer(
1395 string_sprintf("unable to allocate memory %u for file (%s)",
1396 fsize, eml_filename));
1399 result = read (clam_fd, clamav_fbuf, fsize);
1402 CLOSE_SOCKDATA; (void)close(sock); (void)close(clam_fd);
1404 return clmd_errlog_defer(
1405 string_sprintf("can't read spool file %s: %s",
1406 eml_filename, strerror(err)));
1408 (void)close(clam_fd);
1410 /* send file body to socket */
1411 #ifdef WITH_OLD_CLAMAV_STREAM
1412 if (send(sockData, clamav_fbuf, fsize, 0) < 0) {
1413 CLOSE_SOCKDATA; (void)close(sock);
1415 return clmd_errlog_defer(
1416 string_sprintf("unable to send file body to socket (%s:%u)",
1420 send_size = htonl(fsize);
1421 send_final_zeroblock = 0;
1422 if ((send(sock, &send_size, sizeof(send_size), 0) < 0) ||
1423 (send(sock, clamav_fbuf, fsize, 0) < 0) ||
1424 (send(sock, &send_final_zeroblock, sizeof(send_final_zeroblock), 0) < 0))
1428 return clmd_errlog_defer(
1429 string_sprintf("unable to send file body to socket (%s:%u)",
1437 #undef CLOSE_SOCKDATA
1439 } else { /* use scan command */
1440 /* Send a SCAN command pointing to a filename; then in the then in the
1441 * scan-method-neutral part, read the response back */
1443 /* ================================================================= */
1445 /* Prior to the reworking post-Exim-4.72, this scanned a directory,
1446 which dates to when ClamAV needed us to break apart the email into the
1447 MIME parts (eg, with the now deprecated demime condition coming first).
1448 Some time back, ClamAV gained the ability to deconstruct the emails, so
1449 doing this would actually have resulted in the mail attachments being
1450 scanned twice, in the broken out files and from the original .eml.
1451 Since ClamAV now handles emails (and has for quite some time) we can
1452 just use the email file itself. */
1453 /* Pass the string to ClamAV (7 = "SCAN \n" + \0) */
1454 file_name = string_sprintf("SCAN %s\n", eml_filename);
1456 DEBUG(D_acl) debug_printf("Malware scan: issuing %s local-path scan [%s]\n",
1457 scanner_name, scanner_options);
1459 if (send(sock, file_name, Ustrlen(file_name), 0) < 0) {
1462 return clmd_errlog_defer(
1463 string_sprintf("unable to write to socket (%s)", strerror(err)));
1466 /* Do not shut down the socket for writing; a user report noted that
1467 * clamd 0.70 does not react well to this. */
1469 /* Commands have been sent, no matter which scan method or connection
1470 * type we're using; now just read the result, independent of method. */
1472 /* Read the result */
1473 memset(av_buffer, 0, sizeof(av_buffer));
1474 bread = ip_recv(sock, av_buffer, sizeof(av_buffer), MALWARE_TIMEOUT);
1478 return clmd_errlog_defer(
1479 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1481 if (bread == sizeof(av_buffer))
1482 return clmd_errlog_defer("buffer too small");
1483 /* We're now assured of a NULL at the end of av_buffer */
1485 /* Check the result. ClamAV returns one of two result formats.
1486 In the basic mode, the response is of the form:
1487 infected: -> "<filename>: <virusname> FOUND"
1488 not-infected: -> "<filename>: OK"
1489 error: -> "<filename>: <errcode> ERROR
1490 If the ExtendedDetectionInfo option has been turned on, then we get:
1491 "<filename>: <virusname>(<virushash>:<virussize>) FOUND"
1492 for the infected case. Compare:
1493 /tmp/eicar.com: Eicar-Test-Signature FOUND
1494 /tmp/eicar.com: Eicar-Test-Signature(44d88612fea8a8f36de82e1278abb02f:68) FOUND
1496 In the streaming case, clamd uses the filename "stream" which you should
1497 be able to verify with { ktrace clamdscan --stream /tmp/eicar.com }. (The
1498 client app will replace "stream" with the original filename before returning
1499 results to stdout, but the trace shows the data).
1501 We will assume that the pathname passed to clamd from Exim does not contain
1502 a colon. We will have whined loudly above if the eml_filename does (and we're
1503 passing a filename to clamd). */
1506 return clmd_errlog_defer("ClamAV returned null");
1508 /* strip newline at the end (won't be present for zINSTREAM)
1509 (also any trailing whitespace, which shouldn't exist, but we depend upon
1510 this below, so double-check) */
1511 p = av_buffer + Ustrlen(av_buffer) - 1;
1512 if (*p == '\n') *p = '\0';
1514 DEBUG(D_acl) debug_printf("Malware response: %s\n", av_buffer);
1516 while (isspace(*--p) && (p > av_buffer))
1521 /* colon in returned output? */
1522 if((p = Ustrchr(av_buffer,':')) == NULL)
1523 return clmd_errlog_defer(
1524 string_sprintf("ClamAV returned malformed result (missing colon): %s",
1527 /* strip filename */
1528 while (*p && isspace(*++p)) /**/;
1531 /* It would be bad to encounter a virus with "FOUND" in part of the name,
1532 but we should at least be resistant to it. */
1533 p = Ustrrchr(vname, ' ');
1534 result_tag = p ? p+1 : vname;
1536 if (Ustrcmp(result_tag, "FOUND") == 0) {
1537 /* p should still be the whitespace before the result_tag */
1538 while (isspace(*p)) --p;
1540 /* Strip off the extended information too, which will be in parens
1541 after the virus name, with no intervening whitespace. */
1543 /* "(hash:size)", so previous '(' will do; if not found, we have
1544 a curious virus name, but not an error. */
1545 p = Ustrrchr(vname, '(');
1549 malware_name = string_copy(vname);
1550 DEBUG(D_acl) debug_printf("Malware found, name \"%s\"\n", malware_name);
1552 } else if (Ustrcmp(result_tag, "ERROR") == 0)
1553 return clmd_errlog_defer(
1554 string_sprintf("ClamAV returned: %s", av_buffer));
1556 else if (Ustrcmp(result_tag, "OK") == 0) {
1557 /* Everything should be OK */
1558 malware_name = NULL;
1559 DEBUG(D_acl) debug_printf("Malware not found\n");
1562 return clmd_errlog_defer(
1563 string_sprintf("unparseable response from ClamAV: {%s}", av_buffer));
1568 case M_SOCK: /* "sock" scanner type ------------------------------------- */
1569 /* This code was derived by Martin Poole from the clamd code contributed
1570 by David Saez and the cmdline code
1574 uschar * commandline;
1575 uschar av_buffer[1024];
1576 uschar * linebuffer;
1577 uschar *sockline_scanner;
1578 uschar sockline_scanner_default[] = "%s\n";
1579 const pcre *sockline_trig_re;
1580 const pcre *sockline_name_re;
1582 /* find scanner command line */
1583 if (!(sockline_scanner = string_nextinlist(&av_scanner_work, &sep,
1585 sockline_scanner = sockline_scanner_default;
1587 /* find scanner output trigger */
1588 sockline_trig_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1589 "missing trigger specification", &errstr);
1590 if (!sockline_trig_re)
1591 return sock_errlog_defer(errstr);
1593 /* find virus name regex */
1594 sockline_name_re = m_pcre_nextinlist(&av_scanner_work, &sep,
1595 "missing virus name regex specification", &errstr);
1596 if (!sockline_name_re)
1597 return sock_errlog_defer(errstr);
1599 /* prepare scanner call */
1600 commandline = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
1601 commandline = string_sprintf( CS sockline_scanner, CS commandline);
1604 /* socket does not start with '/' -> network socket */
1605 sock = *scanner_options != '/'
1606 ? m_tcpsocket_fromdef(scanner_options, &errstr)
1607 : m_unixsocket(scanner_options, &errstr);
1609 return sock_errlog_defer(errstr);
1611 /* Pass the command string to the socket */
1612 if (m_sock_send(sock, commandline, Ustrlen(commandline), &errstr) < 0)
1613 return sock_errlog_defer(errstr);
1615 /* We're done sending, close socket for writing. */
1616 /* shutdown(sock, SHUT_WR); */
1618 /* Read the result */
1619 memset(av_buffer, 0, sizeof(av_buffer));
1620 bread = read(sock, av_buffer, sizeof(av_buffer));
1624 return sock_errlog_defer(
1625 string_sprintf("unable to read from socket (%s)", strerror(errno)));
1627 if (bread == sizeof(av_buffer))
1628 return sock_errlog_defer("buffer too small");
1629 linebuffer = string_copy(av_buffer);
1631 /* try trigger match */
1632 if (regex_match_and_setup(sockline_trig_re, linebuffer, 0, -1)) {
1633 if (!(malware_name = m_pcre_exec(sockline_name_re, av_buffer)))
1634 malware_name = US "unknown";
1636 else /* no virus found */
1637 malware_name = NULL;
1640 case M_MKSD: /* "mksd" scanner type ------------------------------------- */
1642 char *mksd_options_end;
1643 int mksd_maxproc = 1; /* default, if no option supplied */
1647 if (scanner_options) {
1648 mksd_maxproc = (int)strtol(CS scanner_options, &mksd_options_end, 10);
1649 if ( *scanner_options == '\0'
1650 || *mksd_options_end != '\0'
1652 || mksd_maxproc > 32
1654 return mksd_errlog_defer(
1655 string_sprintf("invalid option '%s'", scanner_options));
1658 if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
1659 return mksd_errlog_defer(errstr);
1661 malware_name = NULL;
1663 DEBUG(D_acl) debug_printf("Malware scan: issuing %s scan\n", scanner_name);
1665 retval = mksd_scan_packed(sock, eml_filename);
1673 malware_ok = TRUE; /* set "been here, done that" marker */
1676 /* match virus name against pattern (caseless ------->----------v) */
1677 if ( malware_name && (regex_match_and_setup(re, malware_name, 0, -1)) ) {
1678 DEBUG(D_acl) debug_printf("Matched regex to malware [%s] [%s]\n", malware_regex, malware_name);
1686 /* simple wrapper for reading lines from sockets */
1688 recv_line(int sock, uschar *buffer, int size)
1692 memset(buffer,0,size);
1694 while(recv(sock,p,1,0) > -1) {
1695 if ((p-buffer) > (size-2)) break;
1696 if (*p == '\n') break;
1697 if (*p != '\r') p++;
1705 /* ============= private routines for the "mksd" scanner type ============== */
1707 #include <sys/uio.h>
1710 mksd_writev (int sock, struct iovec *iov, int iovcnt)
1716 i = writev (sock, iov, iovcnt);
1717 while ((i < 0) && (errno == EINTR));
1720 malware_errlog("unable to write to mksd UNIX socket (/var/run/mksd/socket)");
1725 if (i >= iov->iov_len) {
1732 iov->iov_base = CS iov->iov_base + i;
1739 mksd_read_lines (int sock, uschar *av_buffer, int av_buffer_size)
1745 if ((i = recv (sock, av_buffer+offset, av_buffer_size-offset, 0)) <= 0) {
1747 malware_errlog("unable to read from mksd UNIX socket (/var/run/mksd/socket)");
1752 /* offset == av_buffer_size -> buffer full */
1753 if (offset == av_buffer_size) {
1755 malware_errlog("malformed reply received from mksd");
1758 } while (av_buffer[offset-1] != '\n');
1760 av_buffer[offset] = '\0';
1765 mksd_parse_line (char *line)
1775 if ((p = strchr (line, '\n')) != NULL)
1777 return mksd_errlog_defer(string_sprintf("scanner failed: %s", line));
1780 if ((p = strchr (line, '\n')) != NULL) {
1782 if (((p-line) > 5) && (line[3] == ' '))
1783 if (((p = strchr (line+4, ' ')) != NULL) && ((p-line) > 4)) {
1785 malware_name = string_copy(line+4);
1789 return mksd_errlog_defer(
1790 string_sprintf("malformed reply received from mksd: %s", line));
1795 mksd_scan_packed(int sock, uschar *scan_filename)
1797 struct iovec iov[3];
1798 const char *cmd = "MSQ\n";
1799 uschar av_buffer[1024];
1801 iov[0].iov_base = (void *) cmd;
1803 iov[1].iov_base = CS scan_filename;
1804 iov[1].iov_len = Ustrlen(scan_filename);
1805 iov[2].iov_base = (void *) (cmd + 3);
1808 if (mksd_writev (sock, iov, 3) < 0)
1811 if (mksd_read_lines (sock, av_buffer, sizeof (av_buffer)) < 0)
1816 return mksd_parse_line (CS av_buffer);
1819 #endif /*WITH_CONTENT_SCAN*/